linux-kernel - Re: [PATCH] platform/x86: ISST: Allow reading core-power state on HWP disabled systems

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Message-ID: <23b62f29-902c-800a-1cd4-6e24d70abd86@linux.intel.com>
Date: Thu, 29 Feb 2024 14:32:50 +0200 (EET)
From: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
To: Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
cc: Hans de Goede <hdegoede@...hat.com>, markgross@...nel.org, 
    Andy Shevchenko <andriy.shevchenko@...ux.intel.com>, 
    platform-driver-x86@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] platform/x86: ISST: Allow reading core-power state on
 HWP disabled systems

On Wed, 28 Feb 2024, Srinivas Pandruvada wrote:

> When HWP (Hardware P-states) is disabled, dynamic SST features are
> disabled. But user should still be able to read the current core-power
> state, with legacy P-states. This will allow users to read current
> configuration with static SST enabled from BIOS.
> 
> To address this, do not call disable_dynamic_sst_features() when the
> request is for reading the state.
> 
> Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>

Is this a fix? (It's lacking the tag if it is).

-- 
 i.

> ---
>  drivers/platform/x86/intel/speed_select_if/isst_tpmi_core.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/platform/x86/intel/speed_select_if/isst_tpmi_core.c b/drivers/platform/x86/intel/speed_select_if/isst_tpmi_core.c
> index 2662fbbddf0c..1d918000d72b 100644
> --- a/drivers/platform/x86/intel/speed_select_if/isst_tpmi_core.c
> +++ b/drivers/platform/x86/intel/speed_select_if/isst_tpmi_core.c
> @@ -462,10 +462,10 @@ static long isst_if_core_power_state(void __user *argp)
>  	struct tpmi_per_power_domain_info *power_domain_info;
>  	struct isst_core_power core_power;
>  
> -	if (disable_dynamic_sst_features())
> +	if (copy_from_user(&core_power, argp, sizeof(core_power)))
>  		return -EFAULT;
>  
> -	if (copy_from_user(&core_power, argp, sizeof(core_power)))
> +	if (core_power.get_set && disable_dynamic_sst_features())
>  		return -EFAULT;
>  
>  	power_domain_info = get_instance(core_power.socket_id, core_power.power_domain_id);
>